There are some expensive lenses (Canon L for instance) that have IS but all reasonably priced lenses with IS from any brand I know of are zoom lenses. So if you want stabilization and like prime lenses you are bound to bodies with stabilization.

Fortunately Olympus has IBIS and offers some really good m43 cameras now. They are very likely working on a new body (successor to the E-M5) with a sensor with phase-detect AF capability on the sensor, but as Olympus does not make its own sensors they are dependent on other manufacturers to deliver that sensor. Supposedly Sony will do that.

Different companies make announcement at different times, spread almost randomly over the year. It is not because Panasonic has just announced something that Olympus is now falling behind. People said just the opposite when Olympus announced the E-M5 and Panasonic had no immediate answer. Each company works at its own pace. It doesn't matter because a one year old camera model is still excellent, and even when a new one comes out he old one will continue to be excellent for years to come. New models only matter to people who either always want the latest or are waiting for a specific item to be announced (like the highly anticipated 12-40 lens).